A Phase 3 Study to Assess the Effectiveness and Safety of Zasocitinib in Children and Teenagers Aged 4 to Under 18 With Moderate-to-Severe Plaque Psoriasis

What this Trial Is About

Researchers are studying how well the medicine zasocitinib works, how safe it is, and how children and teenagers aged 4 to under 18 with moderate-to-severe plaque psoriasis respond to it. The study is divided into two parts Part A includes both children and teenagers, while Part B includes only children. Initially, only teenagers who meet the study requirements can participate, with children joining after sufficient information is collected from other studies. Participants in Part A will be randomly assigned to receive either zasocitinib or a matching placebo daily for the first 16 weeks, followed by open-label zasocitinib treatment until the study ends. In Part B, all children will receive zasocitinib throughout the study. The treatment doses for children will be based on their weight, and adolescents will receive a fixed dose. The study lasts up to 4 years and 2 months, including screening, treatment, and safety follow-up periods. During the study, participants will visit the study site multiple times for assessments. Researchers will measure improvements in skin condition using tools like the Static Physicians Global Assessment and Psoriasis Area and Severity Index at Week 16 and throughout the open-label period. Safety and drug levels in the body will also be monitored. After treatment, there is a 4-week safety follow-up. Overall, participants will be involved for up to 217 weeks, including screening, treatment, and follow-up.

A Long-Term Study of Zasocitinib in Children and Teenagers With Plaque Psoriasis